package com.csj.lc.common;

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;

/**
 * 普通类调用Spring bean对象：
 * 注意：此类需要放到App.java同包或者子包下才能被扫描，否则失效。
 */
 
@Component
public class SpringUtil implements ApplicationContextAware{
 
    private static ApplicationContext applicationContext = null;

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
       if(SpringUtil.applicationContext == null){
           SpringUtil.applicationContext  = applicationContext;
       }
    }
 
    //获取applicationContext
    public static ApplicationContext getApplicationContext() {
       return applicationContext;
    }
 
    //通过name获取 Bean.
    public static Object getBean(String name){
       return getApplicationContext().getBean(name);
    }
 
    //通过class获取Bean.
    public static <T> T getBean(Class<T> clazz){
       return getApplicationContext().getBean(clazz);
    }
 
    //通过name,以及Clazz返回指定的Bean
    public static <T> T getBean(String name,Class<T> clazz){
       return getApplicationContext().getBean(name, clazz);
    }
 
}